Ultrafine metal powder slurry

Abstract

In an ultrafine metal powder slurry containing an organic solvent, a surfactant, and an ultrafine metal powder, the surfactant is oleoyl sarcosine, the content of the ultrafine metal powder in the ultrafine metal powder slurry is 70 to 95 percent by mass, and more than 0.05 to less than 2.0 parts by mass of the surfactant is contained relative to 100 parts by mass of the ultrafine metal powder. By the above slurry, reduction in labor and treatment time can be realized in a conductive paste forming process. In addition, since aggregation of particles of the ultrafine metal powder is prevented, an ultrafine metal powder slurry can be provided having superior dispersibility and dry film density.

1. An ultrafine metal powder slurry comprising:
 an organic solvent; 
 a surfactant; and 
 an ultrafine metal powder, 
 wherein the surfactant comprises non-neutralized acid oleoyl sarcosine, the content of the ultrafine metal powder is in the range of 70 to 95 percent by mass, and the content of the surfactant is in a range of more than 0.05 to less than 2 parts by mass relative to 100 parts by mass of the ultrafine metal powder, and 
 wherein the ultrafine metal powder comprises a nickel alloy containing nickel and at least one of vanadium, niobium, molybdenum, tantalum, tungsten, zirconium, yttrium, lanthanum, magnesium, titanium, barium, and calcium. 
 
     
     
       2. An ultrafine metal powder slurry comprising:
 70 to 95 percent by mass of an ultrafine metal powder; 
 more than 0.05 to less than 2 parts by mass of non-neutralized acid oleoyl sarcosine as a surfactant relative to 100 parts by mass of the ultrafine metal powder; and 
 an organic solvent as a balance, 
 wherein a particle size distribution D 90  of the ultrafine metal powder is less than 1.2 μm, and a particle size distribution D 50  indicating the mean particle diameter is in a range of 0.1 to 1.0 μm. 
 
     
     
       3. An ultrafine metal powder slurry comprising:
 an organic solvent; 
 a surfactant; and 
 an ultrafine metal powder, 
 wherein the surfactant comprises non-neutralized acid oleoyl sarcosine, the content of the ultrafine metal powder is in the range of 70 to 95 percent by mass, and the content of the surfactant is in a range of more than 0.05 to less than 2 parts by mass relative to 100 parts by mass of the ultrafine metal powder, 
 the ultrafine metal powder slurry having a specific density of 5 to 6 g/cm 3 . 
 
     
     
       4. An ultrafine metal powder slurry comprising:
 an organic solvent; 
 a surfactant; and 
 an ultrafine metal powder, 
 wherein the surfactant comprises non-neutralized acid oleoyl sarcosine, the content of the ultrafine metal powder is in the range of 70 to 95 percent by mass, the content of the surfactant is in a range of more than 0.05 to less than 2 parts by mass relative to 100 parts by mass of the ultrafine metal powder, a particle size distribution D 90  of the ultrafine metal powder is less than 1.2 μm, and a particle size distribution D 50  indicating the mean particle diameter is in a range of 0.1 to 1.0 μm. 
 
     
     
       5. The ultrafine metal powder slurry according to  claim 4 , wherein the ultrafine metal powder comprises at least one of nickel, copper, silver, molybdenum, tungsten, cobalt, and tantalum. 
     
     
       6. The ultrafine metal powder slurry according to  claim 4 , wherein the ultrafine metal powder comprises a nickel alloy containing nickel and at least one of vanadium, niobium, molybdenum, tantalum, tungsten, zirconium, yttrium, lanthanum, magnesium, titanium, barium, and calcium. 
     
     
       7. The ultrafine metal powder slurry according to  claim 4  having a specific density of 5 to 6 g/cm 3 .